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Miguel Ángel
251ed23252
## Summary
- When `index.html` is a bare fragment (just a `<div>` without `<!DOCTYPE>`), `ensureFullDocument()` wraps it in a minimal HTML document
- The wrapper was missing a CSS reset, so Chrome applied its default `body { margin: 8px }` — creating visible white lines at the top and left edges of rendered video
- Added `* { margin:0; padding:0; box-sizing:border-box }` and `body { overflow:hidden; background:#000 }` to the fragment wrapper
## Test plan
- [x] Render a composition that starts with a bare `<div>` (no `<!DOCTYPE html>`)
- [x] Verify no white lines appear at the edges of the rendered MP4